Centrifugal Pumps A Centrifugal Pump uses rotation to impart velocity to a liquid. It then converts that velocity into flow. Therefore, a centrifugal pump has a two-part nature: 1) Generate energy into a liquid, and 2) Transforming that energy into a steady flow. How does a centrifugal pump perform this function? The design of a centrifugal body incorporates a body casing and an impeller. The impeller is manufactured with vanes extending from the center to the outermost diameter. The pump is powered by electricity. The rapidly spinning impeller creates centrifugal force, which propels the fluid along the vanes of the impeller, and then exits the impeller at the outermost diameter against the casing. The centrifugal pump is one of the most common pumps for trans- porting fluids. Common industries for Centrifugal pumps are HVAC Systems, Chemical plants, Waste Water plants, Power plants, and many other industries where fluids are transported. Centrifugal pumps, like all mechanical equipment, should be designed for the required process conditions. Centrifugal pumps can; however, experience problems with changes to any condition such as, overheating due to low flow and cavitation due to positive suction head is too low for the selected pump - Wikipedia, Centrifugal Pumps. Automatic Recirculation Control (ARC) Valves ARC valves are commonly used to maintain minimum flow to boiler feed pumps and cooling water pumps. They are also used in start-up conditions to protect pumps operating in parallel during swap-over events. Why would a centrifugal pump need an ARC Valve? The advantage of an ARC Valve, which serves as a single piece of equipment installed on the downstream side of the pump, is to ensure a pre-determined minimum flow is maintained through the pump therefore preventing the pump from running dry, which could result in overheating or damage from cavitation. Yarway ARC Valves Overview - Centrifugal Pumps and ARC Values ©2018 Control Southern Inc. All rights reserved. Automation | Engineering | Reliability | Services | Training | Valves & Instrumentation “ ” At low rates, the flow passages in the pump are simply too big. Nevertheless, the passages must be filled with liquid. Flow recirculation results. Flow recirculation can damage the impeller due to cavitation caused by vaporization in the low-pressure regions that recirculation creates. Flow recirculation also stresses pump components with unbalanced forces and vibration. One process modification adds a recirculation loop to keep the pump out of the low flow region. “ ” - From www.chemicalprocessing.com

Yarway ARC Valves - Control Southern I Industrial Automation & … · 2018-02-16 · Yarway ARC Valves and Back Pressure Regulator Yarway ARC valves are self contained, low maintenance

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Page 1: Yarway ARC Valves - Control Southern I Industrial Automation & … · 2018-02-16 · Yarway ARC Valves and Back Pressure Regulator Yarway ARC valves are self contained, low maintenance

Centrifugal PumpsA Centrifugal Pump uses rotation to impart velocity to a liquid. It then converts that velocity into flow. Therefore, a centrifugal pump has a two-part nature: 1) Generate energy into a liquid, and 2) Transforming that energy into a steady flow.

How does a centrifugal pump perform this function? The design of a centrifugal body incorporates a body casing and an impeller. The impeller is manufactured with vanes extending from the center to the outermost diameter. The pump is powered by electricity. The rapidly spinning impeller creates centrifugal force, which propels the fluid along the vanes of the impeller, and then exits the impel-ler at the outermost diameter against the casing.

The centrifugal pump is one of the most common pumps for trans-porting fluids. Common industries for Centrifugal pumps are HVAC Systems, Chemical plants, Waste Water plants, Power plants, and many other industries where fluids are transported.

Centrifugal pumps, like all mechanical equipment, should be designed for the required process conditions. Centrifugal pumps can; however, experience problems with changes to any condition such as, overheating due to low flow and cavitation due to positive suction head is too low for the selected pump - Wikipedia, Centrifugal Pumps.

Automatic Recirculation Control (ARC) ValvesARC valves are commonly used to maintain minimum flow to boiler feed pumps and cooling water pumps. They are also used in start-up conditions to protect pumps operating in parallel during swap-over events.

Why would a centrifugal pump need an ARC Valve? The advantage of an ARC Valve, which serves as a single piece of equipment installed on the downstream side of the pump, is to ensure a pre-determined minimum flow is maintained through the pump therefore preventing the pump from running dry, which could result in overheating or damage from cavitation.

Yarway ARC ValvesOverview - Centrifugal Pumps and ARC Values

“”

At low rates, the flow passages in the pump are simply too big. Nevertheless, the passages must be filled with liquid. Flow recirculation results. Flow recirculation can damage the impeller due to cavitation caused by vaporization in the low-pressure

regions that recirculation creates. Flow recirculation also stresses pump components with unbalanced forces and vibration. One process modification adds a recirculation loop to keep the pump out of the low flow region.

“

” - From www.chemicalprocessing.com

Page 2: Yarway ARC Valves - Control Southern I Industrial Automation & … · 2018-02-16 · Yarway ARC Valves and Back Pressure Regulator Yarway ARC valves are self contained, low maintenance

For Yarway Sales or other Emerson Product Lines, contact us:(770) [email protected]

Yarway ARC Valves and Back Pressure RegulatorYarway ARC valves are self contained, low maintenance and reliable devices, engineered to protect centrifugal pumps against thermal damage and destruction.

Yarway ARC Valves

• Precise recirculation control• Stable design• Integral check valve• Low maintenance

• Self-operating• Ease of installation• Suitable for all fluids• Dampening of pulsations

• Multistage pressure letdown• Cavitation prevention• Eliminate external power sources or signals• Reliable performance

9200 Series:• Highest Volume Applications • 2”-14” in ANSI Class 150-300

9100 Series:• Mid-Pressure Applications• 1”-12” in ANSI Class 600

5300 Series:• High-Pressure Applications • 3”-12” in ANSI Class 900-2500

Yarway Sales, Sizing, Service and MaintenanceContact Control Southern for sales information and about valve sizing, valve service inspection, or valve full-service overhaul.